Locking means for snap gauge measuring pins



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E. H. ALDEBORGH- LOCKING MEANS FOR SNAP GAUGE MEASURING PINS Filed NOV. 25, 1949 June 2, 1953 Patented June 2, 1953 LOCKING MEANS FoR'sNAP GAUGE MEASURING PINS Erik H. Aldeborgh, Poughkeepsie, N. Y., assignor to Standard Gage Company, Inc., Poughkeepsie, N. Y., a corporation of New York 7 Application November 25, 1949, Serial No. 129,273

3 Claims. (Cl. 33--168) The present invention relates to ameans for locking the measuring pins of adjustable limit snap gages in their set position.

In the past it has been common practiceto lock the adjustable pins of snap gages of the type mentioned in .position by means of a locking screw cooperating with a pair of wedging members all assembled in a bore adjacent the pin bore but at right angles thereto with the wedging members cooperating with flat areas of the gaging pin.

This arrangement which has come to be known as the American gage design locking device exerts a satisfactory locking action. However, it tends to place stresses on the gage frame which result in shifting the gaging pins so that their plane surfaces are no longer parallel to the opposed .plane surface of the gaging anvil. As a result of this the accuracy of the gage is affected and particularly is it true when measurements are attempted to be made which are of the order of 10,000ths of an inch (0.0001).

My present device provides a means for looking the engaging pins of adjustable limit snap gages in position without so stressing the frame as .to render the gage surface non-parallel and the gaging consequently inaccurate.

It is an object of the present invention to provide a novel locking means for the gaging .pins of adjustable limit snap gages.

It is another object of the invention to provide such a device which eliminates any stressing of the gage frame and consequent mis-alinement of the gage pins. V Y It is still another obj ect of the invention to provide a means whereby the gaging pins of adjustable snap gagemay be readily set to the desired adjusted position and may be rigidly clamped in that adjusted position. 1 J It is a still furtherobject of the invention to provide a locking means for gagi pins of the type above-mentioned which shall be simple and economical to manufacture and readily used.

Other objects and features of the invention will appear when the following description is considered in connection with the appended drawings, in which,

Figure 1 is a side elevation of an adjustable limit snap gage utilizing the locking means of my present invention;

Figure 2 is a fragmentary cross-sectional view of the lower extremity of the gage frame showing the mode in which the gaging pins are adjustably positioned therein and showing likewise the locking means of my present invention;

Figure 3 is a bottom elevation of the portion of a device illustrated in Figure 2; v e

Figure 4 is a side elevation of a .portion of the gaging pin supporting block; and

Figure 5 is a bottom elevational view of block of Figure 4.

Referring now to the drawings, there is shown at ID the usual U-shaped snap gage framehaving a handle thereon at l I, the frame being supplied at its extremity l2 with a gaging anvil l3 fixed to the frame l2 in any suitable manner as for example by means of the screws '14. As'will be readily understood, the anvil I3 is provided with a fiat lapped surface 15 which cooperates with the gaging pins in performing the gaging operation. 7 i

The above-described construction is that commonly used; my invention relates to the means for locking the gaging pins which cooperate with the anvil IS in their adjusted position.

In the other extremity l6 of frame [0 the gaging pins 11 are mounted, it being essential that the plane upper surfaces I8 of these gaging pins be parallel to the surface 15 of the aging anvil. In order to accomplish this and to provide a locking means for the adjustable gaging pins 11, I provide a block 20 which block seats in a machined recess 2| in the lower extremity Hi of the frame 10. The block 20 is finished so that itslower surface 2| is a plane surface.

Likewise, the upper surface of the extremity l6 remaining after the provision of the recess 2| is a flat plane surface. The block 20 is provided with two bores 22 and 23 which bores are perpendicular to the surface 2|. In thebores 22 and 23 the gaging pins [1 are located, these pins being of course provided with plane surfaces It which, due .to the construction described, are parallel with the surface I5 of anvil IS. The block '20 is provided on its under surface with the two generally circular recesses 24 and 25, the recess 25, however, extending to the edge of the block as clearly seen in Figures 2, 4 and 5.

Gaging pins I! are .provided with a shouldered portion 26 and with a concentric threaded portion 21. The gaging pins 11 are inserted in the block and knurled nuts 28 threaded thereupon after which the block 2|! is positioned upon the frame extremity l6 and fastened in position by means of the screws 30 which extend upwardly through bores in the extremity l6 and threaded into tapped holes in the block 20.

As will be obvious, the lower threaded portions 21 of the pins I! extend into bores ll 11).

the

the extremity 30. At their lower ends the bores 3| are enlarged to provide space for locking nuts 32 which engage the lower threaded portions 21 of pins H. The rotational movement of the pins l! is limited by means of small pins 33 which extend transversely of the block 20 and project intm the; bores 22 amp 2?; thereby; do, operating; with the :iiats formed on. the upper, larger portions of the pins ll.

By means of the construction mentioned it: is possible to lock the gage in anadjus ted, R982 tion by tightening the nuts 32 which-themclanip; the threaded portion 21 of the gaging pins 11'' rigidly since they tend to camp ress tlie extremity; of the gage between the nuts ifigi and thaknurledz. nuts 28. Since the clamping action exerts. a. force in line with the axis of thegaging there, is no tendency to cause a tipping of those pins and consequent lack of parallelism betweenthe. gaging pin faces and the anvil face. It should be m n iq ss s msi smih t ts unser u faces of the knurled nuts 28; he er a at u i a. Theses m 1 the locking nuts .32 aretightenedthe gaging pins will be so. located that their,faqes always', remain parallel to the anvil face 15.

sw i e bv ei i emi re ate he-hei h q z h w -stemmin r n te m s es ina the; uts. 3. nd: urnin he kn rled uts- 5. nt l then ivi sagina n h ights-a e th se esired and: then. lockin he. pins: n: heir et- Dosition by tightening the respective nuts. 3:2:

WhileJL have described: the, preferred: form, of. my.- invention, it will' be; understood; that. many: modifications; ofthe. structure may be, made within the scope of the invention. Tl'ierefore I wishto i be limited; note by theforegoingdescription; but-on the oontrary; solely by the ci'aims grantedto me.

What is claimed is s- 1. A mounting and lockingmeansfor a gaging pin of an adjustable limit'siiap-gage oi the type having a ug-shapeu-f fraine'wit-h a plane faced anvil mounteddn one ext-remity-oi the iran'ieand cooperating gaging; pins; moun ted-fin the opposed extremity; comprising; a gaging pin,- a block mountedjon;one extregnity of}tlie;gag e frame and serving as a mounting for thega'ging pin; said block having aborejherein' perpendicular tigthc anvil'i'ace, a sha lc o i thegaging pinfitting'said bore, a threaded" extension; on said gaging; pin shank, a shouldered-bore the gagee xtreinity in alinement with said block bore; said'sliouldered bore forming a clearancelor said threaded=shank extension, and; locking means comprising a pair of nuts threaded. on said threaded sha'nlg extension, v one of 'saidgnuts lying v against the shoul der in said bore, and the;other -ofthe nutslying against the opposite; face; or" said extremityand lam in th hreadsd a k. n: eiiius ed i tion with respect to said extremity, said block and the anvil.

2. In a mounting and locking means for a gaging pin of an adjustable limit snap gage of the type having a frame with a plane faced anvil and cooperating gaging pins mounted in pppsecli frame .extren itiasi in; combination, a agin pint. a; block mounted rn one extremity of the gage frame and serving as a mounting for the gaging pin, said block having a bore therein perpendicular to the anvil face, a recessinthe'face-of said block adjacent the gage frame; said access being coaxial with said bore, 4 aimed;shouldeiia ztbore in said gage frame, a shanlnonthaga ing pin, said shank extending throughsa-id; bloclcbore and having a threaded extension, extending into said frame bore, adjusting means threaded on said extension and lyingg'inwsaid recess, and locking means threaded on said pin shank extension and lying against ai rame e hould erex he. sit of, the pin. may be adjusted. by, said, adjustin means and set by tighteningsaid; locking ,means to. compress, the, frame. material between said adjusting. means and. said. locking. means.

3. In a, mounting and locking means, for. a, pin of anad'justable.limitqsnan gage of. the, type, having frame with. a plane; faced anvil and, ceoperating. aging. pins, mqunted. in opposed frame extremities,,. injcombinatipiy a. gaging pin, a block mounted on one extremity, of, the gage frame, andserying as, a. mounting for. the. gaging; pin, said block, havin a. bore therein. perpendicular tothe; anvilface, a recess inthefaceof said,block,adjagentthegage.frame;v said recess being. coaxial with. said, bore,-, an alinedi shouldered, bore. in, said, gage irame a h n o h s e n i s id. ta k. am ndin throueh said bloc bore. andhaving. a-threaded extension. extending into said franiabore, ad: just-mg. means threaded. on, said, extension and. lying in said recess, and, a;nut,threaded;on.said pinshank extensionandflyingagainst saidfra bore. shoulder whereby, the. position, of, the. pin ma a u t d, by. a diue ina. w n n set. by; igh en said; l cking, ean to, com.-

press the frame I terial mea s. -ndasa qekinsi. m a

- RI ALDEBQRGH;

References Cited, in, the file Qfj'thifi; patent.

' UNITED: STATES BvTE i -sr Number Name Date 1,470,302 Blood Oct; 16;: 1923 1,57 1;314- Blood Feb.- 2; 1926 2301 832 Kaehlertmy 21 1940 E RE G AT NT Number Country: Date;v

5:22:139' Bianca; Mars 22, 1921 .be w ena a jus ing 

